1111021988 has 12 divisors (see below), whose sum is σ = 1946273280. Its totient is φ = 554943912.

The previous prime is 1111021931. The next prime is 1111021991. The reversal of 1111021988 is 8891201111.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137348 + ... + 145211.

It is an arithmetic number, because the mean of its divisors is an integer number (162189440).

Almost surely, 2^1111021988 is an apocalyptic number.

It is an amenable number.

1111021988 is a deficient number, since it is larger than the sum of its proper divisors (835251292).

1111021988 is a wasteful number, since it uses less digits than its factorization.

1111021988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283546 (or 283544 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 32.

The square root of 1111021988 is about 33331.9964598582. The cubic root of 1111021988 is about 1035.7164752880.

The spelling of 1111021988 in words is "one billion, one hundred eleven million, twenty-one thousand, nine hundred eighty-eight".